fix: param changes should cause immediate rerender

pkg/cy/api/module.go

@@ -32,6 +32,7 @@ type Server interface {
 	SocketName() string
 	ExecuteJanet(path string) error
 	Log(level zerolog.Level, message string)
+	RerenderClients()
 }
 
 func getClient(context interface{}) (Client, error) {

pkg/cy/api/params.go

@@ -7,7 +7,8 @@ import (
 )
 
 type ParamModule struct {
-	Tree *tree.Tree
+	Tree   *tree.Tree
+	Server Server
 }
 
 // haha
@@ -89,5 +90,14 @@ func (p *ParamModule) Set(
 		params = node.Params()
 	}
 
-	return params.Set(string(keyword), value)
+	err = params.Set(string(keyword), value)
+	if err != nil {
+		return err
+	}
+
+	// Many params affect rendering; we need to cause a rerender right
+	// away to ensure all client screens remain accurate.
+	// TODO(cfoust): 10/20/24 maybe this should be under the layout engine so it's throttled?
+	p.Server.RerenderClients()
+	return nil
 }

pkg/cy/janet.go

@@ -41,9 +41,12 @@ func (c *Cy) initJanet(ctx context.Context) (*janet.VM, error) {
 			TimeBinds:   c.timeBinds,
 			CopyBinds:   c.copyBinds,
 		},
-		"pane":  &api.PaneModule{Tree: c.tree},
-		"param": &api.ParamModule{Tree: c.tree},
-		"path":  &api.PathModule{},
+		"pane": &api.PaneModule{Tree: c.tree},
+		"param": &api.ParamModule{
+			Server: c,
+			Tree:   c.tree,
+		},
+		"path": &api.PathModule{},
 		"replay": &api.ReplayModule{
 			Lifetime:  util.NewLifetime(c.Ctx()),
 			Tree:      c.tree,

pkg/cy/module.go

@@ -150,6 +150,17 @@ func (c *Cy) reloadConfig() error {
 	return c.loadConfig()
 }
 
+// RerenderClients triggers a rerender of all clients.
+func (c *Cy) RerenderClients() {
+	c.RLock()
+	defer c.RUnlock()
+
+	clients := c.clients
+	for _, client := range clients {
+		client.layoutEngine.Notify()
+	}
+}
+
 // Get the first pane that another client is attached to or return nil if there
 // are no other clients.
 func (c *Cy) getFirstClientPane(except *Client) tree.Node {